[noggin]

Also Odroid has a few different version C1, C2 etc. The N2 is the only one capable of HDR output? 

Yes - the N2 is the only ODroid based on an AMLogic chip that fully supports HDR output. (The C2 will decode HEVC 10-bit UHD HDR video, but is limited to an 8-bit output path and can't correctly signal Rec 2020 and HDR EOTFs, so it's handled as if it is Rec 709 SDR and will look badly washed out)